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Sodium Metabisulphite (SMBS) is a white, crystalline powder with the chemical formula Na2S2O5. It is a versatile chemical compound with various industrial applications due to its strong reducing properties and ability to release sulfur dioxide. Sodium Metabisulphite is commonly used as a preservative, antioxidant, and disinfectant in several industries.
| Property | Specification |
|---|---|
| Chemical Formula | Na2S2O5 |
| CAS Number | 7681-57-4 |
| Molecular Weight | 190.11 g/mol |
| Appearance | White crystalline powder |
| Assay (Na2S2O5 content) | 96.0% min |
| Sulfur Dioxide (SO2) | 65.0% min |
| pH (1% solution) | 4.0 – 4.6 |
| Water Insoluble Matter | 0.05% max |
| Iron (Fe) | 0.005% max |
| Heavy Metals (as Pb) | 0.001% max |
| Arsenic (As) | 0.0002% max |